Leigh Johnson Lab. Leigh A. Johnson. Brigham Young University. Plant Systematics. Botany. Polemoniaceae.

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ORCID: 0000-0002-1026-0944

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Journal Publications & Book Chapters

[Reprints available on Request]

Johnson, L. A. and J. M. Porter. 2017. Fates of angiosperm species following long-distance dispersal: examples from American amphitropical Polemoniaceae. American Journal of Botany 104: in press.

Simpson, M. G., L. A. Johnson, T. Villaverde, and C. M. Guilliams. 2017. American amphitropical disjuncts: Perspectives from vascular plant analyses and prospects for future research. American Journal of Botany 104: in press.

Simpson, M. G., C. M. Guilliams, and L. A. Johnson. 2017. Patterns and processes of American amphitropical disjunctions: new insights. American Journal of Botany 104: in press.

Baranzelli, M. C., A. Cosacov, G. Ferreiro, L. A. Johnson, and A. Sérsic. 2017. Travelling to the South: phylogeographic spatial diffusion model in Monttea aphylla (Plantaginaceae), an endemic plant of the Monte Desert. PLoS ONE 12(6) e0178827.

Denhem, S. S., L. Zavala-Gallo, L. A. Johnson, and R. E. Pozner. 2016. Insights into the phylogeny and evolutionary history of Calyceraceae. Taxon 65: 1328–1344.

Johnson, R. L., M. R. Stevens, L. A. Johnson, M. D. Robbins, C. D. Anderson, N. J. Ricks, and K. M. Farley. 2016. Molecular and morphological evidence for Penstemon Luculentus (Plantaginaceae): a replacement name for Penstemon fremontii var. glabrescens. PhytoKeys 63: 47–62.

Johnson, L. A., D. Gowen, R. L. Johnson, H. Brabazon, and E. D. Goates. 2016. Navarretia crystallina and N. miwukensis (Polemoniaceae): new species endemic to California with affinity for soils derived from pyroclastic deposits. Phytotaxa 257: 249–260.

Nicola, M. V., S. Sede, R. Pozner, and L. A. Johnson. 2014. Phylogeography and palaeodistribution modelling of Nassauvia subgenus Strongyloma (Asteraceae): exploring phylogeographical scenarios in the Patagonian steppe. Ecology & Evolution: 4: 4270–4286.

Chatwin W, K. K. Carpenter, F. R. Jimenez, D. B. Elzinga, L. A. Johnson, and P. J. Maughan. 2014. Microsatellite primer development for post oak, Quercus stellata (Fagaceae). Applications in Plant Sciences 2: 1400070.

Baranzelli, M. C., L. A. Johnson, A. Cosacov, and A. N. Sérsic. 2014. Historical and ecological divergence among populations of Monttea chilensis (Plantaginaceae), an endemic endangered shrub bordering the Atacama Desert, Chile. Evolutionary Ecology 28: 751-774.

Nicola, M. V., L. A. Johnson, and R. Pozner. 2014. Geographic variation among closely related, highly variable species with a wide distribution range: the south Andean-Patagonian Nassauvia subgenus Strongyloma (Asteraceae, Nassauvieae). Systematic Botany 39: 331–348.

Dockter, R. B., D. B. Elzinga, B. Geary, P. J. Maughan, L. A. Johnson, D. Tumbleson, J. Franke, K. Dockter, and M. R. Stevens. 2013. Developing molecular tools and insights into the Penstemon genome using genomic reduction and next-generation sequencing. BMC Genetics 14: 66

Leavitt, S. D., M. P. Nelsen, H. T. Lumbsch, L. A. Johnson, and L. L. St. Clair. 2013. Symbiont flexibility in subalpine rock shield lichen communities in the Southwestern USA. The Bryologist 116: 149–161.

Johnson, L. A., D. Gowen, and A. B. Jensen. 2013. Cryptic speciation: distinguishing serpentine affiliated sister species Navarretia paradoxiclara and N. paradoxinota from N. intertexta (Polemoniaceae). Phytotaxa 91: 27–38.

Cosacov, A, L. A. Johnson, V. Paiaro, A. A. Cocucci, F. E. Córdoba, and A. N. Sérsic. 2013. Precipitation rather than temperature influenced the phylogeography of the endemic shrub Anarthrophyllum desideratum in the Patagonian steppe. Journal of Biogeography 40: 168–182.

Johnson, L. A., L. M. Chan, R. Pozner, and L. D. Glazier. 2012. Allotetraploids in Patagonia with affinities to western North American diploids: did dispersal or genome doubling occur first? Botanical Review 78: 288–306.

Sede, S. M., M. V. Nicola, R. Pozner, and L. A. Johnson. 2012. Phylogeography and palaeodistribution modeling in the Patagonian steppe: the case of Mulinum spinosum (Apiaceae). Journal of Biogeography 39: 1041–1057.

Johnson, L. A., L. M. Chan, K. Burr, and D. Hendrickson. 2012. Navarretia furnissii (Polemoniaceae), a new diploid species from the intermountain western United States distinguished from tetraploid Navarretia saximontana. Phytotaxa 42: 51–61.

Pozner, Raúl, C. Zanotti, and L. A. Johnson. 2012. Evolutionary origin of the Asteraceae capitulum: insights from Calyceraceae. American Journal of Botany 99: 1–13.

Sérsic, A. N., A. Cosacov, A. A. Cocucci, L. A. Johnson, R. Pozner, J. Avila, J. W. Sites, Jr., and M. Morando. 2011. Emerging phylogeographic patterns of plants and terrestrial vertebrates from Patagonia. Biological Journal of the Linnean Society 103: 475–494.

Leavitt, S. D., L. A. Johnson, T. Goward, and L. L. St. Clair. 2011. Species delimitation in taxonomically difficult lichen–forming fungi: an example from morphologically and chemically diverste Xanthoparmelia (Parmeliaceae) in North America. Molecular Phylogenetics and Evolution 60: 317–332.

Leavitt, S. D., J. D. Fankhauser, D. H. Leavitt, L. D. Porter, L. A. Johnson, and L. L. St. Clair. 2011. Complex patterns of speciation in cosmopolitan ‘‘rock posy’’ lichens – discovering and delimiting cryptic fungal species in the lichen–forming Rhizoplaca melanophthalma species–complex (Lecanoraceae, Ascomycota). Molecular Phylogenetics and Evolution 59: 587–602.

Leavitt, S. D., L. A. Johnson, and L. L. St. Clair. 2011. Species delimitation and evolution in morphologically and chemically diverse communities of the lichen–forming genus Xanthoparmelia (Parmeliaceae, Ascomycota) in western North America. American Journal of Botany 98: 175–188.

Johnson, L. A and H. Cairns–Heath. 2010. Decrypting cryptic species: morphological and molecular evidence for recognizing Navarretia linearifolia as distinct from N. sinistra. (Polemoniaceae). Systematic Botany 35: 618–628.

Cosacov, A., A. N. Sérsic, V. Sosa, L. A. Johnson, and A. A. Cocucci. 2010. Multiple periglacial refugia in the Patagonia steppe and post–glacial colonization of the Andes: the phylogeography of Calceolaria polyrhiza. Journal of Biogeography 37: 1463–1477.

Porter, J. M., L.A. Johnson, and D. Wilken. 2010. Phylogenetic systematics of Ipomopsis (Polemoniaceae): relationships and divergence times estimated from chloroplast and nuclear DNA sequences. Systematic Botany 35: 181–200.

Johnson, L. A., L. M. Chan, T. L. Weese, L. D. Busby, and S. McMurry. 2008. Nuclear and cpDNA sequences combined provide strong inference of higher phylogenetic relationships in the phlox family (Polemoniaceae). Molecular Phylogenetics and Evolution 48: 997–1012.

Johnson, L. A. 2007. Two New Species and a Reassessment of Synonymy in the Navarretia pubescens Complex (Polemoniaceae) of Western North America. Novon: 17: 454–461.

Johnson, L. A. 2007. Transfer of the western North American species Gilia splendens to Saltugilia (Polemoniaceae), and the taxonomic affinities of Gilia scopulorum, Gilia stellata, and Gilia yorkii. Novon 17: 193–197.

Johnson, L. A. and R. L. Johnson. 2006. Morphological delimitation and molecular evidence for allopolyploidy in Collomia wilkenii (Polemoniaceae), a new species from Northern Nevada. Systematic Botany: 31: 349–360.

Weese, T. L. and L. A. Johnson. 2005. Utility of NADP–dependent isocitrate dehydrogenase for species–level evolutionary inference in angiosperm phylogeny: a case study in Saltugilia. Molecular Phylogenetics and Evolution 36:24–41.

Johnson, L. A., K. H. Huish, and J. M. Porter. 2004. Seed surface sculpturing and its systematic significance in Gilia (Polemoniaceae) and segregate genera. International Journal of Plant Sciences 165:153–172.

Weese, T. L. and L. A. Johnson. 2001. Saltugilia latimeri: a new species of Polemoniaceae. Madroño 48: 198–204.

Johnson, L. A. and T. L. Weese. 2000. Geographic distribution, morphological and Molecular characterization, and relationships of Lathrocasis tenerrima (Polemoniaceae). Western North American Naturalist 60: 355–373.

Porter, J. M. and L. A. Johnson. 2000. A phylogenetic classification of Polemoniaceae. Aliso19: 55–91.

Johnson, L. A., D. E. Soltis, and P. S. Soltis. 1999. Phylogenetic affinities of Polemoniaceae inferred from nuclear ribosomal 18S DNA sequences. Plant Systematics and Evolution 214: 65–89.

Johnson, L. A. and D. E. Soltis. 1998. Assessing congruence: examples from empirical data. Pp. 297–343, in Molecular Systematics of Plants, Vol. 2. Eds., P. S. Soltis, D. E. Soltis, and J. J. Doyle. Chapman and Hall, New York.

Porter, J. M. and L. A. Johnson. 1998. Phylogenetic relationships of Polemoniaceae: inferences from mitochondrial nad1 intron sequences. Aliso 17: 157–188.]

Soltis, D. E., P. S. Soltis, D. L. Nickrent, L. A. Johnson, W. J. Hahn, S. B. Hoot, J. A. Sakamoto, R. K. Kuzoff, K. A. Kron, M. W. Chase, S. M. Swensen, E. A. Zimmer, S.–M. Chaw, L. J. Gillespie, W. J. Kress and K. J. Systma. 1997. Angiosperm phylogeny inferred from 18S ribosomal DNA sequences. Annals of the Missouri Botanical Gardens 84: 1–49.

Johnson, L. A., J. L. Schultz, D. E. Soltis, and P. S. Soltis. 1996. Monophyly and generic relationships of Polemoniaceae based on matK sequences. American Journal of Botany 83: 1207–1224.

Soltis, D. E., L. A. Johnson, & C. Looney. 1996. Discordance between ITS and chloroplast topologies in the Boykinia group (Saxifragaceae). Systematic Botany 21: 169–185.

Johnson, L. A. and D. E. Soltis. 1995. Phylogenetic inference in Saxifragaceae sensu stricto and Gilia (Polemoniaceae) using matK sequences. Annals of the Missouri Botanical Gardens 82: 149–175.

Johnson, L. A. and D. E. Soltis. 1994. matK DNA sequences and phylogenetic reconstruction in Saxifragaceae s. str. Systematic Botany 19: 143–156.

Floristic Treatments

Johnson, L. A. and A. G. Day. 2012. Allophyllum, Pp. 1038–1040 in The Jepson Manual: higher plants of California, 2nd Ed., eds. B. G. Baldwin et al., University of California Press, Berkeley.

Johnson, L. A. 2012. Navarretia, Pp. 1062–1068 in The Jepson Manual: higher plants of California, 2nd Ed., eds. B. G. Baldwin et al., University of California Press, Berkeley.

Johnson, L. A. and D. H. Wilken. 2012. Collomia Pp. 1040–1041 in in The Jepson Manual: higher plants of California, 2nd Ed., eds. B. G. Baldwin et al., University of California Press, Berkeley.

Johnson, L. A. 2012. Lathrocasis P. 1054 in The Jepson Manual: higher plants of California, 2nd Ed., eds. B. G. Baldwin et al., University of California Press, Berkeley.

Johnson, L. A. 2012. Saltugilia P. 1072 in The Jepson Manual: higher plants of California, 2nd Ed., eds. B. G. Baldwin et al., University of California Press, Berkeley.